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Dave See <https://bama.edebris.com/download/hallicra/ht37/ht37.pdf> https://bama.edebris.com/download/hallicra/ht37/ht37_second_copy.pdf page PDf 8 I looked at 6-3-9 Power Supply. It mentions setting

Oh Don, It's not always about you...;-) or L26 The final tubes along with C68 and C80 which I don't think are going to be very happy with a 35% over voltage. The margins are beyond best practice. I

Dave, Perhaps you are aiming that at me. I am just looking in, and mostly still wondering why that caution {pause in STBY }was in the manual. I have to believe there is a reason why it says what it

Here is the tube specification: https://www.tubeampdoctor.com/media/pdf/92/f7/3b/6146a_b_rca.pdf Anecdotal comment but I seem to remember rumors about those who modified HV power to solid state

Halden, Russ too Re “just a tad above 1000 V in STBY mode.” I think I made a question comment on Hilden’s topic, saying that I could find no information at all for the conditions under which the

Halden.? The HT-37 came fitted with a grounded line cord.? I installed one in the hot side downstream of the fuse and one in the neutral.? They are 4A, 16 ohm limiters.? Mouser# 527-CL70 Russ

Hi Russ, The 750V marked on the schematic might represent the voltage during key-down.? The HV in my HT-37 with the original tube rectifiers is just a tad above 1000 V in STBY mode. What kind of

Thanks Dave. Will do that next.? The crystal is suspect, so will check for oscillation/frequency first. -- 73, Russ KW6T The cheap item is rarely the least expensive.

Good stuff, Walt.? The articles you posted on your site are helpful. Thank you. -- 73, Russ KW6T The cheap item is rarely the least expensive.

Don. The bleeders are the likely culprit, and the replacement capacitors may also have an effect.? Three 68uf 450V capacitors replaced the two 20uf at 600 V capacitors; about 22uf versus 10uf in the

Oh, after looking, the bleeder is rather too small to make that difference. Sent: Tuesday, August 13, 2024 12:31 PM To: [email protected] Subject: Re: [HallicraftersRadios] Re-membered

Also expect a voltage increase due to switching to semiconductor rectifiers though 250v seems like quite a bit. I only experienced increase like this when I removed the swinging choke which was not

You can find a few technical discussions on the HT-37 at: HT-37 | WD0GOF<https://wd0gof.com/hallicrafters-radio/technical-discussions/ht/ht-37/> Walt Cates, WD0GOF https://wd0gof.com/Hallicrafters A

Re 1000 volts: How is the bleeder? -- don??? va3drl

Thoughts on the dead 40M scenario. Trace the signal path and esp take a hard look at the band switch and any series chokes that might be open. 73 dave wa3gin

Hello all. Somehow, this group disappeared from my groups.io list, so I re-applied. Back in the 1970's I ran an HT-37 with good results--a fine transmitter.? I sold it to a friend, and after about 6

Hi Don, Yes, it's a 0.5 ohm resistor.? I noted this in the post just before the one you cited. */g/HallicraftersRadios/message/30774 (

Halden, this is rather late too Re your comments in [quoted text] and pics in /g/HallicraftersRadios/message/30775 I Halden, I see it much the way you describe, but we don’t know

Sent: Monday, August 12, 2024 2:09 PM To: [email protected] Subject: Re: [HallicraftersRadios] HT-37 transformer failure due to rapid STBY-->OFF-->STBY Don I am not posting here to argue,

DonI am not posting here to argue, I am trying to understand what the posted data means and how it adds to the understanding of the HT-37 power transformer failure.??So far, there was almost no